I punched your expression into Mathematica, but there is some trouble with one part of the summation. The term is sometimes negative, making it impossible to evaluate the factorial. Can you correct this?

dwsmith: Yeah, I'm a student in a campus, but I don't know how to use any of those programs, so I figured an online tool would be the best!

roninpro: The negative factorials are supposed to be interpreted as zero. Well, not actually the factorials, but the binomials with negative bottom number, which happen together with the negative factorials and are usually zero by convention. That's why I wrote things like
instead of just ,
because of those cases where the bottom number is negative.

The only way to correct this would be to write each one of the 34 summands individually... But thanks anyway!